Large dogs and stubborn dogs normally require specialised sizes of collar and equipment designed particularly with them in mind. It can be the size of the collar as well as the high output of stimulation. The range of invisible dog fencing in this category are made for the larger breed of dogs and stubborn dogs.
When looking at these invisible dog fences, you will need to consider what your requirements are, including the determination of your escaping dog and what will work with terrain of your property. Larger dogs may also need a stronger and longer collar strap, the receivers with duropro collar strap is highly recommended for larger dogs.